What Does "rc" Stand For, And Why Are There So Many "rc" Files?

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What does "rc" stand for, and why are there so many
"rc" files?

The letters stand for Run-Com, the name of a command
file on early DEC operating systems. The Unix system's
original "rc" file was /etc/rc, which executes commands
when the system "boots" (or starts up). The name spread
to the C shell startup file .cshrc, the Mail startup
file .mailrc, the Berknet initialization file .netrc,
and the Netnews startup file .newsrc. Programmers could
have chosen a better suffix (such as init) but they
wanted to retain a realm of mystery in the system.

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